A Separable Encryption Domain Information Hiding Method

Abstract

The invention discloses a separable encryption domain information hiding method, which belongs to the technical field of information hiding. The characteristics are: first, read in the image to be protected and divide it into blocks, select the appropriate observation rate to observe it according to the storage space and user needs, and quantize and encode the obtained observation value, and at the same time, the Secret information (such as copyright, identity authentication, etc.) is embedded in the lower 4 bits of each observation value, thereby generating a ciphertext image containing secret information. In the inventive method, the extraction of the secret information and the reconstruction of the protected image are separable. If the user has the extraction key, the secret information can be directly extracted from the encrypted ciphertext image losslessly; if the user is authorized to reconstruct the image, the protected image can be reconstructed with high quality; if both are available, then Secret information and reconstructed images can be obtained simultaneously.

Description

technical field [0001] The invention belongs to the technical field of information hiding, and in particular relates to a separable encryption domain information hiding method. Background technique [0002] With the popularization of cloud computing, more and more image data involving personal privacy are stored and processed on open cloud platforms, such as credit records, medical records, court records, private property records, military fields, business information, etc. How to protect the security of these private data has become one of the most important and urgent research topics at present. Traditional encryption algorithms can convert user data into ciphertext for transmission and storage in the network, thereby hiding the content of user data well; information hiding technology can hide certain secret information (such as copyright, identity authentication, etc.) In the ciphertext, so as to realize the management of ciphertext data retrieval, classification or auth...

AI Technical Summary

Problems solved by technology

However, the encryption process hides the content of the original data, making the signal highly uneven and uncertain, and the information entropy reaches the maximum value from the perspective of visual information theory, which undoubtedly increases the difficulty of information embedding.

[0003] In 2011, Professor Zhang Xinpeng of Shanghai University proposed the concept of encryption domain information hiding for the first time. The carrier image is encrypted with a stream cipher and then divided into blocks, and the spatial domain structure characteristics of the image block are cleverly used to hide the encryption domain. However, under the premise of strict non-destructive The effective embedding capacity is limited, and data extraction and image restoration errors will occur when the embedding capacity increases

However, the improvement of embedded capacity still cannot meet the needs of existing users

With the increasing demand for data security, many problems in encrypted domain information hiding in terms of reversibility, embedding capacity, and algorithm execution efficiency still need to be further studied.

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